01 - In a mixing bowl, whisk together the hoisin sauce, soy sauce, honey, oyster sauce, Shaoxing wine, minced garlic, five-spice powder, grated ginger, sesame oil, and red food coloring (if using) until smooth and well combined.
02 - Add the chicken thighs to the marinade and coat each piece thoroughly. Cover the bowl and refrigerate for at least 2 hours, preferably overnight for deeper flavor penetration.
03 - Preheat the oven to 400°F (200°C). Line a baking tray with aluminum foil and place a roasting rack on top to allow even air circulation around the chicken.
04 - Remove the chicken from the marinade, letting excess drip off, and arrange the thighs on the roasting rack. Reserve the leftover marinade in the bowl for basting.
05 - Roast the chicken for 15 minutes. Remove from the oven and brush generously with the reserved marinade using a pastry brush. Return to the oven and continue roasting for another 10–15 minutes until the glaze is glossy, sticky, and deeply caramelized.
06 - For extra color and smoky flavor, broil the chicken for 2–3 minutes, watching closely to prevent burning. Remove from the oven and let the chicken rest for 5 minutes before slicing.
07 - Slice the char siu chicken into strips and arrange on a serving platter. Scatter sliced green onions and sesame seeds over the top. Serve alongside steamed jasmine rice and stir-fried greens.